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Creep strength of a binary Al(62)Ti(38) alloy

Sturm, Daniel and Heilmeier, Martin and Saage, Holger and Aguilar, Julio and Schmitz, Georg and Drevermann, Anne and Palm, Martin and Stein, Frank and Engberding, Nico and Kelm, Klemens and Irsen, Stephan (2010):
Creep strength of a binary Al(62)Ti(38) alloy.
In: INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, 101 (5), CARL HANSER VERLAG, KOLBERGERSTRASSE 22, POSTFACH 86 04 20, D-81679 MUNICH, GERMANY, pp. 676-679, ISSN 1862-5282,
[Online-Edition: http://dx.doi.org/10.3139/146.110321],
[Article]

Abstract

Al-rich Ti-Al alloys, as compared to Ti-rich gamma-TiAl-based alloys, offer an additional reduction in density of 20%, better oxidation resistance and sufficient strength at high temperatures. High temperature creep of a binary Al(62)Ti(28) alloy was studied in compression in the temperature range between 1173 K and 1323 K in air. It is shown that the alloy exhibits quite reasonable creep resistance at 1173 K, especially in view of its low density of around 3.8 g cm(-3). Stress exponents calculated as the slope n = Delta log (strain rate)/Delta log (stress) = 4 were found to be relatively constant for the temperature and stress regime investigated. This indicates that dislocation climb may be the rate controlling creep mechanism. The values of the activation energies for creep for the as-cast and the annealed Al(62)Ti(38) material coincides well with those found in the literature for interdiffusion of Al in gamma-TiAl.

Item Type: Article
Erschienen: 2010
Creators: Sturm, Daniel and Heilmeier, Martin and Saage, Holger and Aguilar, Julio and Schmitz, Georg and Drevermann, Anne and Palm, Martin and Stein, Frank and Engberding, Nico and Kelm, Klemens and Irsen, Stephan
Title: Creep strength of a binary Al(62)Ti(38) alloy
Language: English
Abstract:

Al-rich Ti-Al alloys, as compared to Ti-rich gamma-TiAl-based alloys, offer an additional reduction in density of 20%, better oxidation resistance and sufficient strength at high temperatures. High temperature creep of a binary Al(62)Ti(28) alloy was studied in compression in the temperature range between 1173 K and 1323 K in air. It is shown that the alloy exhibits quite reasonable creep resistance at 1173 K, especially in view of its low density of around 3.8 g cm(-3). Stress exponents calculated as the slope n = Delta log (strain rate)/Delta log (stress) = 4 were found to be relatively constant for the temperature and stress regime investigated. This indicates that dislocation climb may be the rate controlling creep mechanism. The values of the activation energies for creep for the as-cast and the annealed Al(62)Ti(38) material coincides well with those found in the literature for interdiffusion of Al in gamma-TiAl.

Journal or Publication Title: INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
Volume: 101
Number: 5
Publisher: CARL HANSER VERLAG, KOLBERGERSTRASSE 22, POSTFACH 86 04 20, D-81679 MUNICH, GERMANY
Uncontrolled Keywords: RICH TIAL ALLOYS; AL-TI; 900-DEGREES-C; PHASES; SYSTEM; MODEL
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 21 Mar 2012 09:40
Official URL: http://dx.doi.org/10.3139/146.110321
Identification Number: doi:10.3139/146.110321
Projects: PAK 19
Funders: German Science Foundation (DFG)
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